This is a discussion on weird Cobb catted downpipe sound? within the General Maintenance, Troubleshooting & Accidents. forums, part of the Tech & Modifying & General Repairs category; so I installed a Cobb downpipe on my '12 wrx a few weeks ago, and after installation, I started it ...

weird Cobb catted downpipe sound?

so I installed a Cobb downpipe on my '12 wrx a few weeks ago, and after installation, I started it up, and it sounded a bit strange at idle....Sounds like a diesel, fast tapping noise. It only makes this sound at idle though, usually louder on a cold start. I've gotten mixed responses on what the sound is, but I just wanna see if anyone has the same sound. It's a cobb catted downpipe mated to a stock cat back. anyone have any input?

Can you isolate the noise when listening from the engine bay (not the driver's seat)? In other words, have you tried pushing down on the heat shield, tightening the 02 bung, etc with the car running to see if it stops?

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